From the looks of these parts, I would be printing in white strong flexible due to cost, weight and accuracy of the models. WSF should be enough to get you a couple of test flights without worry.

Personally, I would be adding some vertical bracing to both of these objects as they will inherently bend in that plane. The look good in the renders, but printed or cast in that shape, they will either bend, crack of fail.

Whenever I'm estimating the strength of a part, I think about how you would go about destroying it, bending, sheering, compressing, heating it up, freezing it, how much electrical charge is it isolating etc.

The datasheet I believe is from the manufacturer. I believe melting point is probably where the material becomes a fluid (172-180ºC) while SW is stating it will keep most mechanical properties up to 80ºC without issue. A derating of 50% from the 163ºC softening point is probably not unreasonable.